Rotatable piston



Mar. 3, 1925.

D. J. BOYER ROTATABLE PIsToN Filed Dec. 4. 1923 ATTORNEY.

Patented Mar. 3, 1.925.

UNITED STATES 1,528,182A PATENT OFFICE.

DANIEL J. BOYER, F SOUTH BENI), INDIANA.

ROTATABLE PISTON.

Application led December 4, 1923.

To aZZ lwho/m. it may conc-ern.'

Be it known that I, DANiEL J. BOYER, a citizenof the "United States, residing at South Bend, in the county of St. Joseph and State of Indiana, have invented certa-in new and useful Improvements in Rotatable- Pistons, of which the following is a specifica-v. tion'.

The invention relates to pistons of internal: combustion engines, and has for its ob- Aject to provide means whereby upon the downward movement of the piston, a slight rota-ny movement; will 'be imparted to the piston, thereby obtaining equal wear on the cylinder walls and preventing the cylinders from wearing out of round, so that new istonrings or over sized pistons will be e ective without the necessity of reboring the cylinders.

A further object is topivotally connect the connecting rods to the pistons, thereby allowing the pistons -to rotate, and to provide a spring pressed plunger disposed atl an angle to the axis ofthe pistons, and provided with oppositely disposed pins adapted to be engaged by .recesses in the skirts of the pistons, u on downward movement of the pistons. e anular position of the so plunger imparts a slig t rotation to the pistons.

A further; object is to pivotally connect the pistons to the connecting rods whereby said pistons may completely rotate and to provide the skirts of the pistons with re- `85 cesses extending entirely around the same,

thereby allowing the pistons to be placed within the cylinders without adjustment in relation to the spring actuated lunger.

With the above and other objects in view the invention resides in the combination and arrangement of partsv as v hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within vthe scope of what is claimed without. departing from the spirit of the invention.

In the drawing Fi re 1 is a Vertical longitudinal section view through adjacent cylinders and pistons of an internal combustion engine, showing the piston rotating device applied thereto. Figure 2 is a vertical transverse sectional view through 'a portion of a cylinder and piston and the Apiston rotating device.

ably in a transverse plane.

Serial No. 678,495.

Figure 3 is a top planview of the piston rotating device. i

`Referring to the drawing the numeral l designates a conventional form ot' engine block and 2 cylinders therein. Disposed 4within the cylinders 2 are pistons 3, which pistons as shown in Figure 1 are on their downward stroke. It has been found that if a slight rotation is imparted to the pistons 3, the wearing of the walls of the cylinders 2 out of round/is obviated and consequently new piston rings or over sized pistons will be eiective without the necessity of reboring the cylinders.

Pivota'lly mounted on headed bolts 4 o the heads of the pistons are U-shaped members 5, between the arms 6 of which the upper ends of the connecting rods 7 are mounted on the pins 8, therefore it will be seen th at the pistons 3 may easily rotate during the reciproca-tion thereof. To prevent the headed bolts 4 from unscrewing, pins 8 are provided, which pins extend through the pistons 3 and into said headed bolts. Se-

cured to the under side of the engine block 1 between the cylinders 2 by means of bolts 9 is a plunger casing 10, which casing is provided with a chamber 11, disposed at an angle to the axis of the pistons 3 andy prefer- Slidably mounted within the chamber 11 is a plunger 12, which plunger adjacent its upper end is provided with oppositely disposed lugs 13, which lugs unlderlie the skirts 14 of the pistons 3, and'n positions where theyv will be engaged by the skirts 14, upon downward movement of thepistons3 when they are either en thc intake or powervstrokes. Disposed within the .chamber 11 of the casing 10 is a coiled spring 15, which spring normally forcesthe plunger 12 upwardly into engagement with the under side of the engine block x1, which en ine block limits its upward movement. ugs 13 extend upward through slots 16 in the opposite sides of the casing 10, which slots are angularly disposed in relation to the axis of the pistons 3, and guide the pins 13 in their downward movement.

Upon the downward movement of the istons 3, the lugs 13 are engaged by the sklrts 14 of the pistons and are received in any of the recesses 17, which extend 'entirely around the lower-edges of the skirts. lAs the pistons continuev their downward movement, the plunger 12 moves at an angle to the axis of rotation of the piston is obtained', thereby insuring a uniform circumferential Wearing of the pistons and the cylinders 2v which insures a uniform wearing away of the walls thereof and prevents the cylinders from being worn out of round, therefore over sized rings or pistons may be immediately placed in the cylinders without reboring the Cylinders.

lThe invention having been set forth what .is claimed as new and useful is 1. The combination with a piston disposed Within a cylinder, -a connecting rod pivotally connected to said piston, of yielding means movable at an angle to the axis of the piston and cooperating with the skirt of the piston whereby during a reciprocation ofthe piston said piston will be partially rotated.

. 2. The combination with a piston disposed within a cylinder a connecting rod pivotally connected tos'aid piston, of means for imparting a partial rotation to said piston, said means comprising a member slidably mounted at an angle to the axis of the piston and a lug carried by said slidable' mem-- ber and adapted to engage in a recess in the piston.

3. The combination with a piston disposed within a cylinder, a connecting rod pivotally connected to said piston, of means for imparting a partial rotation to said piston, said means comprising a spring actuated member slidably mounted at an angle to the axis of the piston and a lug carried by said spring actuated member and disposed in a recess in the piston.'

4. The combination with adjacent pistons slidably mounted .in adjacent cylinders, the lower ends of said pistons being provided with a plurality of recesses, of a spring actuated plunger, said plunger being slidably mounted within a casing disposed at an angle to the axis of the pistons and lugs carried 4by said plunger and disposed in recesses of the pistons.

5. The-combination with adjacent pistons slidably mounted inv adjacent cylinders, of means disposed between said pistons and cooperating with said pistons, whereby said pistons will be partially rotated in opposite directions during the reciprooation t ereof.

In testimony whereof I aix my signature.

,DANIEL J. BOYER. 

